Core Insights - The orderly development and efficient utilization of underground space is crucial for optimizing urban spatial structure and enhancing comprehensive urban carrying capacity [1][2] - Future urban underground spaces are expected to exhibit characteristics of "intensive development, intelligent technology, and multifunctional integration" [1][2] Group 1: Urban Development and Infrastructure - Shanghai, with a population of nearly 25 million, prioritizes underground space development as a key component of urban growth, focusing on urban renewal and refined management [1] - The city has completed over 43,700 underground projects, covering a total construction area of nearly 165 million square meters, indicating a clearer underground space layout [1][2] Group 2: Technological Advancements - Significant projects such as the west extension of Metro Line 2 and the second phase of Line 18 are set to open this year, enhancing the planning and design of underground spaces [2] - The integration of advanced technologies in construction, environmental quality assurance, disaster prevention, and digital management is being emphasized to improve the efficiency of underground space utilization [2] Group 3: Forums and Discussions - The conference featured three major thematic forums focusing on various aspects of underground space development, including ventilation purification, complex environment construction, and new material applications [3] - Experts shared innovative solutions for challenges in urban renewal and infrastructure construction, particularly in historical building preservation and existing building rehabilitation [3]